CoreData inserting very huge DB exc_bad_access - iphone

Question

I have ~60000 values in my DB.
I must to keep them all. But while inserting values I get exc_bad_access.
Here is my code:
if (context == nil)
{
context = [(radioAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext];
NSLog(#"After managedObjectContext: %#", context);
}
[self performSelectorOnMainThread:#selector(deleteAllFromDB) withObject:nil waitUntilDone:YES];
// here is JSON parsing
int i=0;
#synchronized(self)
{
NSLog(#"Start");
NSEntityDescription *entity = [[NSEntityDescription entityForName:#"Station" inManagedObjectContext:context] autorelease];
for (NSString*string in stations)
{
if (![string isEqualToString:#""])
{
Station*station = [[[Station alloc] initWithEntity:entity insertIntoManagedObjectContext:nil] retain];
NSError *err = nil;
id parsedData = [NSJSONSerialization JSONObjectWithData:[string dataUsingEncoding:NSUTF8StringEncoding]
options:NSJSONReadingMutableContainers error:&err];
if (err) {
NSLog(#"error is %#", [err localizedDescription]);
}
[station setName:[parsedData objectForKey:#"nm"]];
[station setBit: [parsedData objectForKey:#"btr"]];
[station setEnabled: [NSNumber numberWithInt:1]];
//encoding id of the station
scanner = [NSScanner scannerWithString:[parsedData objectForKey:#"id"]];
[scanner scanHexInt:&tempInt];
NSNumber *numb = [[NSNumber alloc]initWithInt:i];
[station setNumber: [NSNumber numberWithInt:[numb intValue]]];
//encoding country ID
numb = [NSNumber numberWithInt:i];
[station setCountryID: [NSNumber numberWithInt:[numb intValue]]];
//encoding genre ID
numb = [NSNumber numberWithInt:i];
[station setGenerID:[NSNumber numberWithInt:[numb intValue]]];
[station setOrder:[NSNumber numberWithInt:i]];
[context insertObject:station];
float k = [stations count];
k = (i + 1)/k;
[self performSelectorOnMainThread:#selector(increaseProgress:) withObject:[NSNumber numberWithFloat:k] waitUntilDone:YES];
i++;
[scanner release];
[numb release];
[station release];
[parsedData release];
}
}
[context save:nil];
[entity release];
NSLog(#"Stop");
NSEntityDescription *entityGen = [NSEntityDescription entityForName:#"Genre" inManagedObjectContext:context];
NSURL* urlForGenre = [NSURL URLWithString:#"xxx.xxx"];
NSData *genres = [[NSData alloc] initWithContentsOfURL:urlForGenre];
NSError *err = nil;
NSArray *parsedGenres = [NSJSONSerialization JSONObjectWithData:genres options:NSJSONReadingMutableContainers error:&err];
if (err)
{
NSLog(#"error is %#", [err localizedDescription]);
}
for (int i =0; i<parsedGenres.count; i++)
{
Genre*gen = [[Genre alloc] initWithEntity:entityGen insertIntoManagedObjectContext:nil];
gen.name = [[parsedGenres objectAtIndex:i] objectForKey:#"nm"];
int tempInt;
NSScanner *scanner= [[NSScanner alloc] init];
scanner = [NSScanner scannerWithString:[[parsedGenres objectAtIndex:i] objectForKey:#"id"]];
[scanner scanInt:&tempInt];
NSNumber *numb = [[NSNumber alloc] init];
numb = [NSNumber numberWithInt:tempInt];
gen.number = [NSNumber numberWithInt:[numb integerValue]];
float k = [parsedGenres count];
k = (i + 1)/k;
[self performSelectorOnMainThread:#selector(increaseProgress:) withObject:[NSNumber numberWithFloat:k] waitUntilDone:YES];
[context insertObject:gen];
[gen release];
}
[entityGen release];
[context save:nil];
NSEntityDescription *entityCon = [NSEntityDescription entityForName:#"Country" inManagedObjectContext:context];
NSURL* urlForCoun = [NSURL URLWithString:#"yyy.yyy"];
NSData *countr = [[NSData alloc] initWithContentsOfURL:urlForCoun];
err = nil;
NSArray *parsedCountr = [NSJSONSerialization JSONObjectWithData:countr options:NSJSONReadingMutableContainers error:&err];
if (err)
{
NSLog(#"error is %#", [err localizedDescription]);
}
NSMutableArray* temp = [[NSMutableArray alloc] init];
for (int i =0; i<parsedCountr.count; i++)
{
Country*countr = [countr initWithEntity:entityCon insertIntoManagedObjectContext:nil];
countr.name = [[parsedCountr objectAtIndex:i] objectForKey:#"nm"];
int tempInt;
NSScanner *scanner= [[NSScanner alloc] init];
scanner = [NSScanner scannerWithString:[[parsedCountr objectAtIndex:i] objectForKey:#"id"]];
[scanner scanInt:&tempInt];
NSNumber *numb = [[NSNumber alloc] init];
numb = [NSNumber numberWithInt:tempInt];
countr.number = [NSNumber numberWithInt:[numb integerValue]];
[temp addObject:countr];
float k = [parsedCountr count];
k = (i + 1)/k;
[self performSelectorOnMainThread:#selector(increaseProgress:) withObject:[NSNumber numberWithFloat:k] waitUntilDone:YES];
[context insertObject:countr];
[countr release];
}
[context save:nil];
If my app doesn't crash, yes, it happens not by every launch. It crashes on:
Country*countr = [countr initWithEntity:entityCon insertIntoManagedObjectContext:nil];
Please help! And sorry for my terrible English.
Update:
On:
Country*countr = [countr initWithEntity:entityCon insertIntoManagedObjectContext:nil];
Thread 7: EXC_BAD_ACCESS (code=1, address=0x3f800008)
Other error is exc_bad_access too. But with code=2 and on other thread.
Update 2:
I enabled zombies mode in scheme of my debug. Nothing happened.
Update 3:
I think I have problems with memory.
GuardMalloc: Failed to VM allocate 4128 bytes
GuardMalloc: Explicitly trapping into debugger!!!

Answer 1

You can't pass nil as managedObjectContext parameter to initWithEntity:insertIntoManagedObjectContext: method. Try changing this:
Country*countr = [countr initWithEntity:entityCon insertIntoManagedObjectContext:nil];
to this
// pass managed object context parameter
Country*countr = [countr initWithEntity:entityCon insertIntoManagedObjectContext:context];

Answer 2

Based on the documentation and my experience you can pass nil as managedObjectContext.
I was also getting an EXC_BAD_ACCESS and it came that the reason was that I was not retaining the managed object model(I was only creating a model to get the entity description and then it was released).
In particular, this is what I was doing:
In a test class, in the setUp method:
- (void)setUp
{
[super setUp];
NSBundle *bundle = [NSBundle bundleForClass:[self class]];
NSURL *modelURL = [bundle URLForResource:#"TestDatamodel" withExtension:#"momd"];
NSManagedObjectModel *model = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
STAssertNotNil(model, nil);
_entity = [[model entitiesByName] objectForKey:NSStringFromClass([MyEntity class])];
STAssertNotNil(_entity, nil);
// ...
}
Then in a test method I was creating a managed object without a context like this:
NSManagedObject *object = [[NSManagedObject alloc] initWithEntity:_entity insertIntoManagedObjectContext:nil];
And I was getting EXC_BAD_ACCESS here.
The solution was to add an ivar to the test class to keep a reference to the managed object model.